CVE-2023-30670 in Smart Phone
Summary
by MITRE • 07/06/2023
Out-of-bounds Write in BuildIpcFactoryDeviceTestEvent of libsec-ril prior to SMR Jul-2023 Release 1 allows local attacker to execute arbitrary code.
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Analysis
by VulDB Data Team • 07/24/2023
The vulnerability identified as CVE-2023-30670 represents a critical out-of-bounds write flaw within the BuildIpcFactoryDeviceTestEvent function of the libsec-ril library component. This issue affects devices prior to the SMR Jul-2023 Release 1 security patch cycle, making it a persistent threat in older Android implementations. The vulnerability exists in the telephony subsystem's security interface library, which handles communication between the Android framework and the modem's security module. This particular function processes factory test events that are typically used during device manufacturing and testing phases, making it accessible through legitimate system interfaces that should remain secure from unauthorized manipulation.
The technical exploitation of this vulnerability occurs through a buffer overflow condition where the BuildIpcFactoryDeviceTestEvent function fails to properly validate input parameters before writing data to memory locations. This flaw stems from inadequate bounds checking mechanisms within the function's implementation, allowing an attacker to craft malicious input that exceeds the allocated buffer size. The out-of-bounds write creates a condition where attacker-controlled data can overwrite adjacent memory locations, potentially corrupting critical program state or executable code. This type of vulnerability falls under CWE-787 Out-of-bounds Write, which is classified as a direct consequence of insufficient input validation and memory management practices.
The operational impact of this vulnerability extends beyond simple code execution capabilities, as it enables local privilege escalation attacks that can compromise the entire device security framework. An attacker with local access to the system can leverage this flaw to execute arbitrary code with elevated privileges, potentially gaining access to sensitive cryptographic keys, user data, or communication channels. The vulnerability's location within libsec-ril makes it particularly dangerous because this library interfaces directly with modem security functions, potentially allowing attackers to bypass security mechanisms designed to protect against unauthorized access. The attack surface is further expanded by the fact that factory test events are often accessible through system services that maintain elevated permissions, creating a pathway for privilege escalation attacks.
Mitigation strategies for CVE-2023-30670 must prioritize immediate patch deployment to devices running affected versions of the Android operating system. Organizations should implement comprehensive security monitoring to detect potential exploitation attempts through anomalous system behavior or unauthorized access patterns. The recommended approach includes applying the SMR Jul-2023 security patches that contain fixed implementations of the BuildIpcFactoryDeviceTestEvent function with proper input validation and bounds checking. Additionally, system administrators should consider implementing runtime protections such as stack canaries, address space layout randomization, and code integrity checks to reduce the effectiveness of exploitation attempts. Security teams should also conduct thorough vulnerability assessments of all telephony-related components and implement network segmentation to limit potential lateral movement if exploitation occurs. This vulnerability aligns with ATT&CK technique T1068, which describes Local Port/Service Exploitation, and T1059, representing Command and Scripting Interpreter, as attackers can leverage the code execution capabilities to establish persistent access or escalate privileges within the compromised system.